共查询到7条相似文献,搜索用时 0 毫秒
1.
In this paper, a new analytical-engineering method of closed form solution for stress intensity factors of shear modes for 3-D finite bodies with cracks is derived by the time saving energy release rate method. Hence a complete series of useful results of stress intensity factorsK
II andK
III can be obtained. And the results provided by this method are in good agreement with some obtained by other methods. 相似文献
2.
圆盘状裂纹前缘塑性区尺寸及张开位移估计 总被引:1,自引:0,他引:1
将Dugdale模型推广到三维裂纹问题计算了圆盘状裂纹前缘塑性区尺寸,并结合断裂力学中的Barenblatt-Dugdale裂纹模型和三维J-积分原理计算了圆盘状裂纹前缘张开位移,得到了J-积分与裂纹张开位移的关系,最后用非线性有限元方法对圆盘状裂纹的前缘塑性区尺寸作了数值分析,确定了公式中的未知常数,并对其正确性作了数值验证,本文的工作推广了Dugdale模型的应用范围。 相似文献
3.
M.H. Kargarnovin C. NasiraiM.R. Torshizian 《Theoretical and Applied Fracture Mechanics》2011,56(1):42-48
The fracture problem of a crack in a functionally graded strip with its properties varying in a linear form along the strip thickness under an anti-plane load is considered. The embedded anti-plane crack is located in the middle of strip half way through the thickness. The third mode stress intensity factor is derived using two different methods. In the first method, by employing Fourier integral transforms, the governing equation is converted to a singular integral equation, which is subsequently solved numerically by the collocation method based on Chebyshev polynomials. Then, the problem is solved by means of finite element method in which quadrilateral 8-node singular elements around each crack tip are used. After inspecting the validity of the solution technique, effects of crack geometry and non-homogeneous material parameter on the stress intensity, energy release and energy density are studied and the results of analytical and FEM solutions are compared. 相似文献
4.
In this paper,a weighted residual method for the elastic-plastic analysis near a crack tip is systematically given by taking the model of power-law hardening under plane strain condition as a sample.The elastic-plastic solutions of the crack tip field and an approach based on the superposition of the nonlinear finite element method on the complete solution in the whole crack body field,to calculate the plastic stress intensity factors,are also developed.Therefore,a complete analysis based on the calculation both for the crack tip field and for the whole crack body field is provided. 相似文献
5.
Effect of electric displacement saturation on the stress intensity factor for a crack in a ferroelectric ceramic 总被引:3,自引:0,他引:3
A crack in a ferroelectric ceramic with perfect saturation under electric loading is analyzed. The boundary of the electric displacement saturation zone ahead of the crack tip is assumed to be ellipse in shape. The shape and size of ferroelectric domain switching zone near a crack tip is determined based on the nonlinear electric theory. The stress intensity factor induced by ferroelectric domain switching under small-scale conditions is numerically obtained as a function of the electric saturation zone parameter and the ratio of the coercive electric field to the yield electric field. It is found that the stress intensity factor increases as the ratio of the semi-axes of the saturation ellipse increases. 相似文献
6.
7.
In the present paper, three dimensional analyses of some general constraint parameters and fracture parameters near the crack
tip. of Mode I CT specimens in two different thicknesses are carried out by employing ADINA program. The results reveal that
the constraints along the thickness direction are obviously separated into two parts: the keeping similar high constraint
field (Z1) and rapid reducing constraints one (Z2). The two fields are experimentally confiremed to correspond to the smooth region and the shear lip on the fracture face
respectively. So the three dimensional stress structure of Mode I specimens can be derived through discussing the two fields
respectively. The distribution of the Crack Tip Opening Displacement (CTOD) along the thickness direction and the three dimensional
distribution of the void growth ratio (Vg) near the crack tip are also obtained. The two fracture parameters are in similar trends along the thickness direction, and
both of them can reflect the effect of thickness and that of the loading level to a certain degree. 相似文献